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An overhead valve engine, abbreviated (OHV) and sometimes called a pushrod engine, is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with flathead (or "sidevalve") engines , where the valves were located below the combustion chamber in the engine block .
In addition to noise pollution that can cause hearing impairment and stress in wildlife, [19] according to the U.S. Forest Service, old-style two-stroke engines (no longer a component of new off-road vehicles, although some are still in use) "emit about 20 to 33 percent of the consumed fuel through the exhaust" and "discharge from two-stroke ...
The engine was discontinued in 2003, replaced by the 2.2-liter DOHC Ecotec engine. Although it displaces 134 cu. in, the 2.2-liter OHV is still commonly referred to as the GM 122 today, and has been reputed for its simplicity, reliability, and ease of maintenance in the J-body cars and S-series trucks, and a few L-body cars.
This engine was redesigned as an OHV for the 1956 model year, [3] but the flathead version reemerged in 1958 as the economy engine for the "new" Rambler American and remained available through 1965. [3] American Motors introduced a die-cast aluminum block version of the OHV 195.6 cu in (3.2 L) engine in 1961 and produced it through 1964. [4]
OHV may refer to: . Overhead valve engine; Off-highway vehicle, aka off-road vehicle; Off-roading; California State Parks, Off-Highway Motor Vehicle Recreation Division; El Mirage Off-Highway Vehicle Recreation Area at El Mirage Lake
OHC cylinder head (for a 1987 Honda D15A3 engine) An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. [1] [2] This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion chamber in the engine block. [3]
A single camshaft located in the engine block uses pushrods and rocker arms to actuate all the valves. OHV engines are typically more compact than equivalent OHC engines, and fewer parts mean cheaper production, but they have largely been replaced by OHC designs, except in some American V8 engines.
The Opel OHV family (also known as the Kadett engine and Viva engine after its most famous applications) is a pushrod inline-four engine. It was the first all-new engine developed by Opel of Germany after World War II and was released in 1962. Versions were in use through 1993.